libmnl
1.0.3
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00001 /* This example is placed in the public domain. */ 00002 #include <stdio.h> 00003 #include <stdlib.h> 00004 #include <unistd.h> 00005 #include <string.h> 00006 #include <time.h> 00007 00008 #include <libmnl/libmnl.h> 00009 #include <linux/if.h> 00010 #include <linux/if_link.h> 00011 #include <linux/rtnetlink.h> 00012 00013 int main(int argc, char *argv[]) 00014 { 00015 struct mnl_socket *nl; 00016 char buf[MNL_SOCKET_BUFFER_SIZE]; 00017 struct nlmsghdr *nlh; 00018 struct ifinfomsg *ifm; 00019 int ret; 00020 unsigned int seq, portid, change = 0, flags = 0; 00021 00022 if (argc != 3) { 00023 printf("Usage: %s [ifname] [up|down]\n", argv[0]); 00024 exit(EXIT_FAILURE); 00025 } 00026 00027 if (strncasecmp(argv[2], "up", strlen("up")) == 0) { 00028 change |= IFF_UP; 00029 flags |= IFF_UP; 00030 } else if (strncasecmp(argv[2], "down", strlen("down")) == 0) { 00031 change |= IFF_UP; 00032 flags &= ~IFF_UP; 00033 } else { 00034 fprintf(stderr, "%s is not `up' nor `down'\n", argv[2]); 00035 exit(EXIT_FAILURE); 00036 } 00037 00038 nlh = mnl_nlmsg_put_header(buf); 00039 nlh->nlmsg_type = RTM_NEWLINK; 00040 nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; 00041 nlh->nlmsg_seq = seq = time(NULL); 00042 ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifm)); 00043 ifm->ifi_family = AF_UNSPEC; 00044 ifm->ifi_change = change; 00045 ifm->ifi_flags = flags; 00046 00047 mnl_attr_put_str(nlh, IFLA_IFNAME, argv[1]); 00048 00049 nl = mnl_socket_open(NETLINK_ROUTE); 00050 if (nl == NULL) { 00051 perror("mnl_socket_open"); 00052 exit(EXIT_FAILURE); 00053 } 00054 00055 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) { 00056 perror("mnl_socket_bind"); 00057 exit(EXIT_FAILURE); 00058 } 00059 portid = mnl_socket_get_portid(nl); 00060 00061 mnl_nlmsg_fprintf(stdout, nlh, nlh->nlmsg_len, 00062 sizeof(struct ifinfomsg)); 00063 00064 if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { 00065 perror("mnl_socket_send"); 00066 exit(EXIT_FAILURE); 00067 } 00068 00069 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); 00070 if (ret == -1) { 00071 perror("read"); 00072 exit(EXIT_FAILURE); 00073 } 00074 00075 ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL); 00076 if (ret == -1){ 00077 perror("callback"); 00078 exit(EXIT_FAILURE); 00079 } 00080 00081 mnl_socket_close(nl); 00082 00083 return 0; 00084 }